Processing Machinery
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POM barrel residual pressure
Problem Phenomenon
After POM shutdown and restart, the first shot always has drooling cold material
Cause Analysis
During shutdown, barrel residual pressure makes the melt slowly seep out at the nozzle and oxidize; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Release pressure by screw retraction before shutdown; purge by air shot first when restarting; keep the nozzle warm; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Shutdown pressure release and start-up purging are standard actions; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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